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Here are three FX units I made in JUCE. I offer them for free precompiled as VST3 for Windows, but also have attached the source code next to the plugins in the downloads, so you can also freely compile them on Mac or Linux!

The first is a bandpass modulator: This kind of effect is very prominent in psytrance music, and interestingly also in old workstation synths from the 90s/2000s (i.e. Korg Triton).



The unique feature of it is that the filter jumps can be locked to notes instead of any random frequency. After I made the video, I also added Note Lock functionality to support sharp notes.

The second is a polyphonic Resonator that works using 100+ parallel bandpass filters. You can choose on which octaves and notes it should be active, and it can phase cancel the original sound so you hear only the metallic resonances. I recommend filtering the signal with your favourite EQ afterwards.



And finally the third one is a 129-band comb filter where the frequencies can be spread evenly either in equal intervals to get metallic sounds, or multiplicatively to get FM-like tones.



Download: aquanode.gumroad.com

Small disclaimer: I relied on AIs to help me with coding, but putting everything together from the general idea, project management, compiling and testing I did myself.
Last edited by aquanode on Mon Feb 02, 2026 11:34 pm, edited 6 times in total.

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aquanode wrote: Sun Jan 25, 2026 10:05 am Here are two FX units I made in JUCE. I offer the source code for free, so I hope that counts!

The first is a bandpass modulator: This kind of effect is very prominent in psytrance music, and interestingly also in old workstation synths from the 90s/2000s (i.e. Korg Triton).



The second is a polyphonic Resonator that works using 100+ parallel bandpass filters. You can choose on which octaves and notes it should be active, and it can phase cancel the original sound so you hear only the metallic resonances. I recommend filtering the signal with your favourite EQ afterwards.

Very generous, thank you! I look forward to trying them out.

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Helmut Keller Audio jsfx
https://www.helmutkelleraudio.de/
https://www.kvraudio.com/developer/helmut-keller-audio
Crossfeed Plugin For Headphones
TWD DLX II
360 ° Panner
and more

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Image

Get Quantum Delay Lite for free here

✓ Same Sound Quality
✓ All Delay Algorithms
✓ Modulation System
✓ Sync Delay to DAW
✓ Lowpass Filter
✓ Feedback
✓ Presets

✕ Stereo / Dual Mono switch per section
✕ Input Routing
✕ Variable Filter Types
✕ Crossfeed
✕ Phase Invert
✕ Pan & Width

All Lite presets can be imported into the full version - pick up exactly where you left off.
GS DSP Audio Plugins
https://gs-dsp.com

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One Knob Compressor + One Knob Exciter + One Knob Reverb
https://www.musicxart.co.uk/music.html#downloads

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Can't remember where I saw this (hopefully not this thread... : ) but I came across them just yesterday

https://luna-co-software.github.io/luna ... github.io/

A console EQ, multi-compressor, and a tape-sim are available now, with more in progress on their development list. All free and OSS.

Free and OSS - 'linux first', but also available for mac and win.
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neverbeeninariot wrote: Mon Jan 26, 2026 9:26 pm Can't remember where I saw this (hopefully not this thread... : ) but I came across them just yesterday

https://luna-co-software.github.io/luna ... github.io/

A console EQ, multi-compressor, and a tape-sim are available now, with more in progress on their development list. All free and OSS.

Free and OSS - 'linux first', but also available for mac and win.
Thanx man!
I only found the Tape and the Comp downloadable!?
Both sound impressive! :o
Looking forward to the other anounced plugins.
What a surprise. :party: :phones:
ABX is enemy to GAS

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neverbeeninariot wrote: Mon Jan 26, 2026 9:26 pm Can't remember where I saw this (hopefully not this thread... : ) but I came across them just yesterday

https://luna-co-software.github.io/luna ... github.io/
Thanx man!
I only found the Tape and the Comp downloadable!?
Same here ...
The link for the EQ download goes straight to the multi-comp download ...

[edit] download is working as expected now, thanx :) [/edit]
Last edited by thecontrolcentre on Tue Jan 27, 2026 3:08 am, edited 1 time in total.

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I haven't seen a plugin as cool as multi-comp in a long time... I hope development continues and it gets even more refined... However, it's already a great plugin.
I love coffee...

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neverbeeninariot wrote: Mon Jan 26, 2026 9:26 pm https://luna-co-software.github.io/luna ... github.io/

A console EQ, multi-compressor...
I d'loaded the Compressinator, and once I moved past the Opto it is rather cool. I am not so obsessed with old models but ultimately, even if one only uses one mode ever, the way it feels is v good. Many compressors may be technically right at the math but they don't have a good ballistic feel, these do. Normally, I wouldn't ever load, let alone use, a Muti-Band but this was nice as a WTF bonus.

I had it running in Reason 13 for a while with no apparent issues.
:-)

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gsdsp wrote: Mon Jan 26, 2026 10:47 am Image

Get Quantum Delay Lite for free here

✓ Same Sound Quality
✓ All Delay Algorithms
✓ Modulation System
✓ Sync Delay to DAW
✓ Lowpass Filter
✓ Feedback
✓ Presets

✕ Stereo / Dual Mono switch per section
✕ Input Routing
✕ Variable Filter Types
✕ Crossfeed
✕ Phase Invert
✕ Pan & Width

All Lite presets can be imported into the full version - pick up exactly where you left off.
Thank you :)
FL Studio 25 | AudioThing JULY - Deimos - U-he Filterscape - NI Kontour - Softube Model 80 - LUSH-2 - UAD Opal - WaveOSC

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neverbeeninariot wrote: Mon Jan 26, 2026 9:26 pm Can't remember where I saw this (hopefully not this thread... : ) but I came across them just yesterday

https://luna-co-software.github.io/luna ... github.io/

A console EQ, multi-compressor, and a tape-sim are available now, with more in progress on their development list. All free and OSS.

Free and OSS - 'linux first', but also available for mac and win.
They are really good. I just uploaded a YT video showcasing these plugins.


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Here is another 100% free and open source plugin from me (again with the help of AIs while coding but idea, putting everything together and testing from me) :)

Springer is a algorithmic Spring Reverb Delay with up to 7 coils that uses phase dispersion to create the classic springy dub sounds, but a bit more artificial since its not trying to be a physically realistic model. That said, you can change parameters that on a real spring would refer to thickness, length, interference, resistance and so on. :hyper:

See it in action:


And this video shows only the pure impulse response outputs from an earlier version where pitch was not yet changeable, but it is included in the download:




Download (simply put in $0 in the payment option):
aquanode.gumroad.com/l/springervst

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